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Figure out <size> argument of llvm.lifetime intrinsics at the moment they are created (during function inlining)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167821 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2012-11-13 07:15:32 +00:00
parent 266c473b91
commit 009c4d86c1
3 changed files with 77 additions and 13 deletions
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lib/Transforms/Utils/InlineFunction.cpp
+21 -2
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@@ -668,10 +668,29 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
if (hasLifetimeMarkers(AI))
continue;
builder.CreateLifetimeStart(AI);
// Try to determine the size of the allocation.
ConstantInt *AllocaSize = 0;
if (ConstantInt *AIArraySize =
dyn_cast<ConstantInt>(AI->getArraySize())) {
if (IFI.TD) {
Type *AllocaType = AI->getAllocatedType();
uint64_t AllocaTypeSize = IFI.TD->getTypeAllocSize(AllocaType);
uint64_t AllocaArraySize = AIArraySize->getLimitedValue();
assert(AllocaArraySize > 0 && "array size of AllocaInst is zero");
// Check that array size doesn't saturate uint64_t and doesn't
// overflow when it's multiplied by type size.
if (AllocaArraySize != ~0ULL &&
UINT64_MAX / AllocaArraySize >= AllocaTypeSize) {
AllocaSize = ConstantInt::get(Type::getInt64Ty(AI->getContext()),
AllocaArraySize * AllocaTypeSize);
}
}
}
builder.CreateLifetimeStart(AI, AllocaSize);
for (unsigned ri = 0, re = Returns.size(); ri != re; ++ri) {
IRBuilder<> builder(Returns[ri]);
builder.CreateLifetimeEnd(AI);
builder.CreateLifetimeEnd(AI, AllocaSize);
}
}
}